I read policy guidence note and it is written in the policy If you are the family member of a Tier 4 (General) Student who is studying in outer London or anywhere else in the United Kingdom, you must have 2 months maintenance of £450 per month, to support yourself.
http://www.ukba.homeoffice.gov.uk/sitec ... olicy1.pdf
the family member of a tier 4 (general) Student where the student has an established presence in the uK if the tier 4 (general) Student is studying in
inner london
72. If you are the family member of a Tier 4 (General) Student who is studying in inner London,
you must have 2 months maintenance of £600 per month, to support yourself.
73. For example, if the Tier 4 (General) Student who is studying in inner London is making an application at the same time as their spouse and two children. They must show that they have £600 for their spouse and a further £600 for each child, in addition to £1000 required for their own
support. In total the family will require evidence that they hold 2 months maintenance of £2800 per month in available funds (£600 x 3 = £1800 + £1000).
if the tier 4 (general) student is studying in outer london or anywhere else in the uK
74. If you are the family member of a Tier 4 (General) Student who is studying in outer London or anywhere else in the United Kingdom, you must have 2 months maintenance of £450 per month, to support yourself.
75.For example, if the Tier 4 (General) Student who is studying in outer London or anywhere else in the United Kingdom is making an application at the same time as their spouse and two children. They must show that they have £450 for his/her spouse and a further £450 for each child, in addition to £800 required for their own support. In total the family will require evidence that they hold 2 months maintenance of £2150 per month in available funds (£450 x 3 = £1350 +£800).